Requires occupants of motor vehicles to wear safety belts, with certain exceptions. Repeals conflicting laws concerning stopping, inspecting, or detaining vehicles to determine compliance with safety belt laws. Reinserts at a different location the statute concerning primary enforcement of safety belt laws. Provides that a law enforcement agency may not use a safety belt checkpoint to detect and issue a citation for failure to wear a safety belt. Makes conforming changes.

Requires the department of transportation (department) to design and manufacture signs to inform drivers of offenses and penalties related to operating a vehicle in or near highway work zones. Establishes higher minimum penalties for exceeding posted highway work zone speed limits. Establishes various offenses related to operating a vehicle in or near highway work zones. Requires that funds collected as judgments for violating the speed limit in a highway work zone be transferred to the department to pay the costs of hiring off duty police officers to perform certain duties.

Prohibits the department of transportation and the department of natural resources from selling or distributing nursery stock or wildflower seeds to certain residents of other states and certain businesses.